<style>  
#all{  
    margin:0px auto;  
    width:100px; /* 韫囧懘銆忛崚璺虹暰鐎硅棄瀹�*/  
    height:400px;  
    background-color:white;
    text-align:center; /* 閸ユ儳鍎氱仦鍛厬 */  
    padding-top:200px; /* 閸ユ儳鍎氭稉濠傦綖閸忥拷*/  
    padding-bottom:200px; /* 閸ユ儳鍎氭稉瀣綖閸忥拷*/  	
}  
</style> 
<div id="all">
<input type="button" value="login" onClick="AndroidLogin('loginKey')" /> 
</div>
<script type="text/javascript">  
window.onload=function(){ 
Android.LoginMengchuang(null,null);
} 

    function AndroidLogin(loginKey) {  
        Android.dismis();   
    } 
</script>